Stop motion, etc.



NACHSMN ETC STOP MOTION,

Filed July 13, lQS

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UNITED STATES PATENT OFFICE STOP MOTION, ETC.

AdolphWachsman, Brooklyn, N. Y., assignor to Stop-Motion DevicesCorporation, Brooklyn, N. Y., a corporation of New York Application July13, 1935, Serial No. 31,234

Claims. (Cl. Gti- 163) This invention relates to strand tension devicesing a coil of a spring I 5, the other end of which and more particularlyto such devices when apspring passes through a hole in the lower wall I6plied to textile machines, and more especially of the casing I, a washeror other element I'l of knitting machines, for the purpose of effecting`a diameter or size greater than the diameter of 5 the stopping of themachine and avoiding the the hole in the wall I6, serving to retain thatend 5 breaking of a yarn or thread or needles. The of the spring I5. Thetension of the spring may mechanism or device hereinafter to bedescribed be conveniently varied by means of a pivoted in detail, isespecially useful when applied to a catch or detent I8 which ispivotally mounted in multi-feed knitting machine where several the wallI6 as by means of a screw I9. To eiect 10 threads or yarns are beingsimultaneously fed desired adjustments of the spring I5 the catch 10 tothe needles. or detent I8 is provided with a bent portion 2U In thedrawing: which may be readily engaged to swing the catch Fig. 1 is aside elevational View of the thread 'to and from the spring engagingposition, a notch tension mechanism, a thread engaging lever beor recess2l permitting the catch to pass being shown in two parts and a portionof the cover tween convolutions of the coil spring I5 and re- 15 of thecasing within which some of the partsl tain the spring in any desiredposition of adare housed being broken away more clearly to iustment.

show the construction; When operating as a stop motion the device Fig. 2is a front elevational View of the parts is provided with a contact 22including a screw 23 2o shown in Fig. 1; and nuts 24 the latterretaining the head of the 20 Fig. 3 is a fragmentary view of the partsshown screw 23 in clamping engagement with a leaf in Fig. l with thelever in a dilerent position; Spring Contact between WhCh and the upperand wall 26 of the casing I is clamped on insulating Fig. 4 is a view ofthe under side of the houswasher 2'I as of rubber. A second insulatingrub- 25 ing showing a catch or detent which serves adber or other washer28 is interposed between 25 justably to tension a spring acting upon thelever. the nuts 24 and the upper casing wall 26. The

Within the housing or casing I is mounted a contact spring 25 is thusinsulated from the memetallic contact element 2 the latter beingsuptallic casing I, the diameter of the shank of the ported upon an end3 of a lever 4 and being a screw 23 being smaller than the diameter ofthe 30 part thereof. One arm of lever 4 is conveniently hole in the wall26 through which the shank 30 formed of wire bent into the desiredshape. Spepasses, and the shank being, preferably, surcically and asshown for purposes of illustrarounded by one of the washers 2T, 28.tion, that arm of lever 4 is bent into more or When the opposed face ofcontact 2 engages less U-shape as at 5, a grou-ved porcelain or leaf 25as shown in Fig. 3, an electric circuit (not Other U-Shaped eyelet 5being retained in the shown) is closed which operates astop motion as 35night Of the end 5- The leVeI' arm iS turned usual in devices of thischaracter, one side of the at right angles as at I Such right angled endcircuit being connected to the casing I, as by being adapted t0 engageWall 3 Of the easing l the screw I9 or by means of a common return thuslimiting its upward swinging movement. through the machine frame towhich each casing FTOHI the right angled POItOn 1 the Said arm I isconnected at 28', there being a stop motion 40 is again bent at rightangles as at 9, the eXtreme mechanism associated with each feedingstation. end 3 extending at right angles t0 the portion 9 The other sideof the circuit is connected to the and passing through a hole I0provided in a leaf contact 25 as by means of a wire held bewall II ofthe casing I `and through a hole in the tween the nuts 24.

cover I2, the lever 4 thus being conveniently The parts just describedare, preferably, in- 45 mounted for swinging movements in opposed closedin the casing l as by means of the cover Walls of the casing I. Thecontact 2 is made plate or wall I2, lugs 29 engaging correspondingfastto the aforesaid arm of lever 4 to move ly shaped notches 30 provided inthe cover plate therewith as by means of a set screw I3, the to seat thecover in position and prevent the 50. latter passing through a hole inthe contact 2 and same from turning. A screw 3l which passes 50 intoclamping engagement with the end 3 of through a hole in the cover plateI2 and into the lever arm. Depending from the contact 2 is threadedengagement with the wall Il retains the the other arm of lever 4consisting of a wire-like cover plate I2 in position.

U-shaped element I4 one end of which is made It is ordinarilyadvantageous to use a relafast to the contact 2 and the' other endengagtively long spring in connection with movable le- 55 ber moves inthe direction to close the circuit, the tendency of said means to resistmovement of the said contact member being substantially reduced when themovable contact member is in engagement with the other Contact member.

3. A strand controlled stop motion mechanism adapted to stop movementsof a strand from a source of supply an-d including a movable arm,

the construction and operation being such that when the arm is movedfrom one position to another position by the strand, movement of thestrand from the source of supply is temporarily arrested, the arm whenmoving from the iirst mentioned position to the second mentionedposition first encountering increased resistance to said movement, theresistance to the movement of the arm being substantially decreased whenthe stop motion is actuated.

4. A stop motion for a knitting machine including a movable member themovements of which are yarn controlled, the said member being moved toone position by excess tension on the yarn and when in said positionacting to effect the stopping of the knitting of the yarn, means actingupon the said member tending to retain it in a position where the stopmotion is not effective, the construction and operation of the mechanismbeing such that when the member moves to the position to effect stoppingof the machine the effective force of the said means acting inopposition to the said movement of the member is substantially decreasedap-proximately when the stop motion is actuated.

5. A stop motion for a knitting machine including a closed housingWithin which are electrical contacts for effecting the stopping of themachine, one of such contacts being movable with respect to the other toclose and open the electric circuit, a lever to which the contact firstmentioned is connected, said lever being pivotally connected to the saidhousing one arm of the lever being positioned within the housing and theother arm thereof extending to the outside thereof, spring means at oneend slidably connected to the arm first mentioned, the sliding of thespring along the arm acting to decrease the tension of the spring meansupon the arm, the said spring means at the other end being connectedtothe housing, the lever arm second mentioned having an eyelet throughwhich a yarn may pass, the said lever being movable upon its axis underthe influence of the yarn passing through the said eyelet,

6. A yarn controlled stop motion lever and a support therefor, saidlever being pivotally connected intermediate its ends to the saidsupport to provide two lever arms, spring means connected to one of thesaid arms, said spring means being movable adjacent to the pivot pointof the lever as the said lever moves in one direction,

said arms being circumferentially adjustable with respect to the axis ofthe lever, and movable therealong, the relative adjustment of the twoarms varying the eifective force exerted by the spring upon the said onearm, the said spring means being adjustably mounted in the support, asupport and an adjustable connection between the spring and the support,

7. A housing including walls enclosing the contained mechanism on allsides, contact members for an electric circuit enclosed in said housing,one of said contact members being movable with respect to the other toeffect the. closing of the circuit, spring means for normally keepingthe circuit open, said spring means being also enclosed within thehousing and being so connected to the movable contact member that whenthe movable contact member has moved to a position to close the circuit,the force` of the spring tending to maintain the circuit open isdecreased.

8. An electric stop motion for a knitting machine including a closedhousing and contact members mounted therein to effect the closing of anelectric circuit, a lever pivotally mounted in the said housing, one armof the said lever extending outwardly of the housing and the other armbeing contained within the housing, one of the said contact membersbeing connected to the said lever and movable therewith, the movementsof the lever being responsive to strand tension, adjustable spring meansfor acting upon the lever arm mounted Within the housing normally toretain the other arm in non-circuit closing position, the said other armbeing movable to another position in response to strand tension inopposition to the force exerted by the adjustable means acting upon the.arm within the housing, the last mentioned movement of the said otherarm being in opposition to the tension exerted by the said adjustablespring means and being substantially reduced as the circuit is closed.

9. A stop motion mechanism including a support, a movable arm and aspring connected at one end to the arm and at its other end to thesupport, said other end of the spring being adjustably connected to thesupport and means for effecting adjustment of the spring including amovable catch adapted to engage between convolutions of the spring toretain the same in adjusted position.

10. A stop motion including a housing, a lever pivotally mounted in thehousing and a spring contained therein, one end of said spring beingconnected to the lever the other end of the spring passing through thehousing, a catch mounted externally of the housing and adapted to engageand retain the spring in any one of several positions of adjustment tovary the tension exerted by the spring upon the lever.

ADOLPH WACHSMAN.

